.TH std::ispunct 3 "2024.06.10" "http://cppreference.com" "C++ Standard Libary"
.SH NAME
std::ispunct \- std::ispunct

.SH Synopsis
   Defined in header <cctype>
   int ispunct( int ch );

   Checks if the given character is a punctuation character as classified by the
   current C locale. The default C locale classifies the characters
   !"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~ as punctuation.

   The behavior is undefined if the value of ch is not representable as unsigned char
   and is not equal to EOF.

.SH Parameters

   ch - character to classify

.SH Return value

   Non-zero value if the character is a punctuation character, zero otherwise.

.SH Notes

   Like all other functions from <cctype>, the behavior of std::ispunct is undefined if
   the argument's value is neither representable as unsigned char nor equal to EOF. To
   use these functions safely with plain chars (or signed chars), the argument should
   first be converted to unsigned char:

 bool my_ispunct(char ch)
 {
     return std::ispunct(static_cast<unsigned char>(ch));
 }

   Similarly, they should not be directly used with standard algorithms when the
   iterator's value type is char or signed char. Instead, convert the value to unsigned
   char first:

 int count_puncts(const std::string& s)
 {
     return std::count_if(s.begin(), s.end(),
                       // static_cast<int(*)(int)>(std::ispunct)         // wrong
                       // [](int c){ return std::ispunct(c); }           // wrong
                       // [](char c){ return std::ispunct(c); }          // wrong
                          [](unsigned char c){ return std::ispunct(c); } // correct
                         );
 }

.SH Example


// Run this code

 #include <cctype>
 #include <clocale>
 #include <iostream>

 int main()
 {
     unsigned char c = '\\xd7'; // the character × (multiplication sign) in ISO-8859-1

     std::cout << "ispunct(\\'\\\\xd7\\', default C locale) returned "
               << std::boolalpha << (bool)std::ispunct(c) << '\\n';

     std::setlocale(LC_ALL, "en_GB.iso88591");
     std::cout << "ispunct(\\'\\\\xd7\\', ISO-8859-1 locale) returned "
               << std::boolalpha << (bool)std::ispunct(c) << '\\n';
 }

.SH Possible output:

 ispunct('\\xd7', default C locale) returned false
 ispunct('\\xd7', ISO-8859-1 locale) returned true

.SH See also

   ispunct(std::locale) checks if a character is classified as punctuation by a locale
                        \fI(function template)\fP
   iswpunct             checks if a wide character is a punctuation character
                        \fI(function)\fP
   C documentation for
   ispunct

        ASCII values            characters    iscntrl  isprint  isspace  isblank  isgraph  ispunct  isalnum  isalpha  isupper  islower  isdigit  isxdigit
decimal hexadecimal   octal                   iswcntrl iswprint iswspace iswblank iswgraph iswpunct iswalnum iswalpha iswupper iswlower iswdigit iswxdigit
0–8     \\x0–\\x8     \\0–\\10    control codes   ≠0       0        0        0        0        0        0        0        0        0        0        0
                              (NUL, etc.)
9       \\x9         \\11       tab (\\t)        ≠0       0        ≠0       ≠0       0        0        0        0        0        0        0        0
                              whitespaces
10–13   \\xA–\\xD     \\12–\\15   (\\n, \\v, \\f,    ≠0       0        ≠0       0        0        0        0        0        0        0        0        0
                              \\r)
14–31   \\xE–\\x1F    \\16–\\37   control codes   ≠0       0        0        0        0        0        0        0        0        0        0        0
32      \\x20        \\40       space           0        ≠0       ≠0       ≠0       0        0        0        0        0        0        0        0
33–47   \\x21–\\x2F   \\41–\\57   !"#$%&'()*+,-./ 0        ≠0       0        0        ≠0       ≠0       0        0        0        0        0        0
48–57   \\x30–\\x39   \\60–\\71   0123456789      0        ≠0       0        0        ≠0       0        ≠0       0        0        0        ≠0       ≠0
58–64   \\x3A–\\x40   \\72–\\100  :;<=>?@         0        ≠0       0        0        ≠0       ≠0       0        0        0        0        0        0
65–70   \\x41–\\x46   \\101–\\106 ABCDEF          0        ≠0       0        0        ≠0       0        ≠0       ≠0       ≠0       0        0        ≠0
71–90   \\x47–\\x5A   \\107–\\132 GHIJKLMNOP      0        ≠0       0        0        ≠0       0        ≠0       ≠0       ≠0       0        0        0
                              QRSTUVWXYZ
91–96   \\x5B–\\x60   \\133–\\140 [\\]^_`          0        ≠0       0        0        ≠0       ≠0       0        0        0        0        0        0
97–102  \\x61–\\x66   \\141–\\146 abcdef          0        ≠0       0        0        ≠0       0        ≠0       ≠0       0        ≠0       0        ≠0
103–122 \\x67–\\x7A   \\147–\\172 ghijklmnop      0        ≠0       0        0        ≠0       0        ≠0       ≠0       0        ≠0       0        0
                              qrstuvwxyz
123–126 \\x7B–\\x7E   \\172–\\176 {|}~            0        ≠0       0        0        ≠0       ≠0       0        0        0        0        0        0
127     \\x7F        \\177      backspace       ≠0       0        0        0        0        0        0        0        0        0        0        0
                              character (DEL)
